ASSESSMENT OF EXTENT AND RATE OF WETLAND LOSS IN PORT HARCOURT METROPOLIS

Amadi, O. M. P., Gobo, A. E.&Ngah, S. A.

Institute of Geosciences and Environmental Management

Rivers State University, Port Harcourt.

Email: sogbujiic@yahoo.com

ABSTRACT

The study assessed the extent and rate of wetland loss in Port Harcourt Metropolis Between 1990to 2020. To achieve this, research questions were postulated. The study utilized quasi-experimental design and made use of satellite images of Port Harcourt Metropolis of 1990, 2000 and 2020. The major land-use types identified in the study alongside wetlands include built up area, water bodies, farmland/sparse vegetation. The findings from the study revealed that in 1990 wetland occupied a spatial extent of 123.23 km² (26.89%) of the land use pattern of the study area. Consequently, in year 2020, there was dramatic change as wetland size reduced to 44.61 km² (9.74%) of the total land-use pattern of the study area.Markov’s probability of land-use change for 30 years (2020-2050) showed that the probability for wetland changing to a built up area for 30 years (2050), was 0.0049 (0.49%). The study concluded that other land-use type’s especially built-up areas have continued to increase the rate and extent of wetland loss in the study area. The study recommended that adequate and continuous monitoring of wetland by making use of satellite remote sensing should be encouraged in the study area. Also, there should be wetland protection and management through the use of land use planning and management.

Keywords: Assessment, Extent, Rate, Wetland loss, Port Harcourt

ESTIMATION OF TRANSMISSIVITY VALUES FROM SURFACE GEOELECTRICAL METHOD IN PART OF MUBI, ADAMAWA STATE

Lazarus G. Ndatuwong

Adamawa State University, Mubi

Department of Pure & Applied Physics

Email: ndatuwong@gmail.com

ABSTRACT

An estimation of transmissivity distribution in part of Mubi metropolis of the basement rock terrain using surface geoelectrical method was carried out in this work. Thirteen (13) Vertical Electric Sounding (VES) were conducted in the area using SAS 1000 Terrameter with three (5) of the VES points located near five boreholes with an existing pumping test result. The resistivity data were modeled using IPI2Win and WinResist modelling software.  The general shape of the resistivity curves model shows a highly resistive basement which considered the longitudinal conductance as the dominant Dar-Zarrouk parameter. Aquifer longitudinal conductance at each of the VES points were calculated using the well-known Dar-Zarrouk parameter equation outline in this work. Transmissivity values obtained from the pumping test resultare plotted against the aquifer longitudinal conductance values calculated from the VES data close to the boreholes. A linear regression relationship between transmissivity, T and the longitudinal conductance, Lc was established and used to compute the transmissivity values at each of the VES points where pumping test was not conducted. The result of the estimated transmissivity values and the transmissivity values obtained from the pumping test result were compared. The close agreement between the calculated transmissivity values from analysis of VES data and transmissivity values obtained from pumping test data attests to the validity of the method.

Key words: Aquifer, Transmissivity, Dar-Zarrouk, Vertical electrical Sounding (VES), Longitudinal Conductance.

AN ASSESSMENT OF RESIDENTIAL DENSITY AND TYPOLOGY OF HANWA AREA OF ZARIA, KADUNA STATE TachiaNambeh&Munir

TachiaNambeh&Munir Adebayo

Department of Vocational & Technical Education, Benue State University, Makurdi

Department of Architecture, Ahmadu Bello University, Zaria-NigeriaEmail: mfachia@gmail.com; ridwan234@hotmail.com

ABSTRACT

Understanding the effect of building and human population on urban land and environment is important for urban governance and creation of liveable urban environment. This is important for a realistic urban planning for sustainable development. This work enumerated the building density and typology of Hanwa area of Zaria this was carried out through physical surveys and on-site enumeration, the survey revealed a building density of 607buildings on an area of 273150m². It also indicates a shift from bungalow to storey buildings. This implies that the demographics densities are increasing to cope with it. It now rests with the planning authorities in Zaria city to take cognisance of this fact and plan accordingly.

EVALUATION OF SAW DUST CONCRETE WITH VARIOUS PERCENTAGES OF METAKAOLIN

Gana A.J.; Ogunleye, O. D. &Braimoh S.O.

Department of Civil Engineering

Landmark University,Omu-AranEmail: phildebo123@gmail.comor braimohsolo@gmail.com

ABSTRACT

This study established the effects of Metakaolin on Sawdust Concrete as an additive in concrete composites. The workability density, flexural strength and compressive strength of the sawdust concrete and Sawdust Concrete with various percentages (i.e 5%, 10% and 15%) of Metakaolin were compared to that of normal mix batch conventional concrete. The mix design was based on relevant concrete mix design codes. The 150mm x 150mm x 150mm cube specimens was used for the compressive strengthtesting of 200mm x 100mm x 50mm rectangular Beam specimens Test for flexural strength. The specimens were cured in water and were tested after 7, 14 and 28 days. The tests showed that the workability of concrete reduces after using Sawdust as full replacement of sand and also reduces after the addition of Mekaolin in Sawdust concrete. Tests on compressive and flexural strength showed that Sawdust Concrete had light weight, but the addition of Mekaolin enhanced the strength of the concrete, although concrete strength does not increase proportionally with increasing fibre. The increased in strength was just up to a certain Metakaolin compressive and flexural strength after 28days of curing

Keywords: Strength, Evaluation, Saw-dust, Concrete, Metakaolin